/home/ythoma/docs/math2mat/svn/wp1/framework/m2mGUI/src/m2m/backend/octaveparser/ReadWriteIndex.java

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package m2m.backend.octaveparser;

import java.util.Vector;

public class ReadWriteIndex
{
        public int writeIndex;
        public Vector<Integer>  readIndex;
        
        
        public ReadWriteIndex() 
        {
                writeIndex = 1;
                readIndex = new Vector<Integer>();
        }
        
        public ReadWriteIndex(ReadWriteIndex rwi) 
        {
                writeIndex = rwi.writeIndex;
                readIndex = new Vector<Integer>(rwi.readIndex);
        }
        
        public ReadWriteIndex getNextVariable() {
                readIndex.setElementAt(writeIndex, readIndex.size()-1);
                writeIndex++;
                return this;
        }
        
        
        public ReadWriteIndex getPreviousVariable() {
                writeIndex--;
                readIndex.setElementAt(writeIndex-1, readIndex.size()-1);
                return this;
        }
        
        
        public void addReadIndex() 
        {
                if(readIndex.size() == 0)
                        readIndex.add(0);
                else
                        readIndex.add(readIndex.lastElement());
        }
        
        
        public void removeReadIndex() 
        {
                if(readIndex.size() > 1)
                        readIndex.remove(readIndex.size()-1);
        }

        
        public int getReadIndex()
        {
                if(readIndex.size() == 0)
                        readIndex.add(0);
                return readIndex.lastElement();
        }
        
        public int getWriteIndex()
        {
                return writeIndex;
        }
}